Contemporary Research QMOD-HDMI 2 Ürün Kılavuzu - Sayfa 11

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Converged RF and IPTV Distribution

QMODs can distribute MPEG2 and/or H.264 (MPEG4 AVC) over RF and IP.
For Program A and Program B, you can independently assign MPEG2 or H.264 encoding, as well as distribution over RF only, IP only and
RF plus IP. Here's how this works for typical applications:
•
Dual-Program RF or IP only Distribution
o
Dual RF only would typically use MPEG2 encoding, and will create a single MPTS (Multiple Program Transport
Stream) stream with two programs, usually identified as XXX.1 and XXX.2.
o
Dual IPTV will typically use H.264, distributing two independent SPTS (Single Program Transport Stream) IPTV
streams, multicast or unicast. You can also choose AAC audio when you're only sending programs over IP (Programs
over RF must be AC-3 or MP12).
•
Dual-Program IP and RF Distribution. The QMOD encoder can create the most efficient streams for RF+IP distribution. In
most cases, both programs would be encoded as MPEG2, as most TVs can't decode H.264 over RF.
o
The Dual RF+IP setting will create a single MPEG2 MPTS stream for RF, with two programs, usually identified as
XXX.1 and XXX.2.
o
The Dual RF+IP setting will create two independent MPEG2 SPTS streams, multicast or unicast.
•
One-Program Split RF and IP Distribution. This combination uses one encoder for MPEG2 for RF, and the second encoder for
H.264 for IPTV. Both could be encoding video from the same source, or two different sources can be used.
o
Program A would be set for RF, encoding a single MPEG 2 stream, formatted as a QAM channel for RF.
o
Program B would be set for IPTV, encoding a single H.264 stream at a much lower bitrate for IPTV distribution.
Any other combination can be employed, and will follow the same structure:
•
If two Programs assigned for RF, the encoder will format both into a single MPST stream.
•
IPTV streams will always be independent SPST streams
Unicast
This form of Video over Ethernet creates a link from the QMOD to a specific IP receiver. The pros are that this stream will operate over
most current networks and routers. The takeback is that the stream can be viewed by one receiver at a time, and you need to set up
the link within the QMOD.
Multicast
Multicasting is am more intelligent solution, as you can broadcast the stream with a multicast address, and the routers switches do the
work of sending and copying the stream to receivers that request it.
The usual catch for integration is that not all switches can handle multicasting. All of the site's routers and switches must have
multicasting and IGMP enabled, which may require either software updates or new equipment. IGMP protocol restricts the routing of
streams to only the receivers that request the media.
Multicast IP addresses range from 224.0.0.1 through 239.255.255.255, which are set aside for multicast streams. However, there are
"reserved" combinations in that range that don't work efficiently, so you'll want to use addresses assigned by the IT department.
Typical "non-reserved" addresses include:
239.0.0.5
239.0.27.xxx (default CR IGMP group)
239.0.0.6
239.3.0.1
239.0.100.99
239.0.1.1
.
Contemporary Research
11
QMOD Modulators HD/IPTV Encoders